Slightly surprised to discover that chip board from different manufacturers/vintages does not fit together:-(
Plan is to square the edges, cut slots and fit a plywood tongue.
Next issue is sourcing the inlet and exit grills for the bathroom extract. I have purchased a Manrose fan but didn't want the integrated ceiling light so didn't buy the kit. Cold loft area so I need to insulate the duct anyway. Exterior is going on white uPVC cladding. Suggested sources?
the thin chip left behind after slotting will be weak. Why do it.
NT
Because that is how it is done,very common, sometimes with plastic tongue for flooring.
Because there isn't always a convenient supporting joist and the joint will be glued. An alternative might be a half lap.
An alternative is to screw them down and fill the gaps with a suitably stiff sealant.
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